<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>display属性</title>
    <style>
        .a {
            width: 200px;
            height: 200px;
            background-color: rgb(255, 166, 0);
            display: none;
        }
        .b {
            width: 200px;
            height: 200px;
            background-color: skyblue;
        }
    </style>
</head>
<body>
    <div class="a"></div>
    <div class="b"></div>
</body>
</html>